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(N'GModelf) H. D. WILKINS. SWELL FOBA PIPE ORGNS.

I Patented Apr. 19, '1887.

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IIIII l By Af! UNITED STATES- PATENT OFFICE.

- y HERVE'D. WILKINs, on ROCHESTER, NEW YORK.

.'swELL Fon lPIPE-oneens.,v

sPncnfIeA'rIoN forming p'rt or Letter; Parent no. 551,562, nanfa April 19,1188?.

Appnnun niet Maren n, 1ero.

To @ZZ whom t may concern:v

-Be it known that I, HERVE D. WILKrNs, -a citizen of the United States, residing at Roch1 ester, in the county of Monroe' and State, of New York, -haveinvented a new and usfful v Improvementin Swells for' Pipe-Orgahs, Aof which the following' is a specification, referpuce being had to the accompanying drawn'gs.

My invention rentes to Swen-boxes for pi'pei organs having either single'or double swellfolds; and it consists of the novel arrangement and operation of the, folds, as hereinafter described.

The object o f my invention iste produce a steady progressive crescendo from the greatganist shall have perfect control of the swellf01dsat all points Qrrheimsvtmeemove together.

estpossible piano to the' greatest possible forte, and to furnish means by which the orclosing of the folds or shutters C. Abox, B, A

is built into the front of the swell-box, open ou its frontand the opening provided with and entirely filled .by the two 4sets of folds C rEhe folds of each set are -connected together by rods H H, pivoted to the elbows I I on Aeach fold in. the usual manner, so'that all The foldsC C have pivots a a on their ends, which pivots t into sockets in the frame of the box B, and the folds turn freely on such pivots. lThe folds are rabbeted on their edges, as shown at d, Figs. 1 and 3, in order to more eifectuallyshut in the sound of the swell-organ I f pipes when closed.. A rod, D, passes through the box B,1nidwa'y between the two sets of folds, and having bearingsin the edges there# of, through whiehit reciprocates, and is connected in the usual manner with the swellpedal located. below the key-board of the organ, by which pedal the organist opens and closes the swell-folds. The rod Dis provided sei-n1 No. mme. (Np moan.)

withelbows E E,'o`r other suitable connections secured to it, to which are pivoted the rodsF F, and the twoend folds, or any pair of them opposite each other, are providedwith elbows G G,to-which the rods F F are also pivoted. These lugs E E and G G are so placed that when the folds C C are closed `the rods F F are v at rightangles with the folds androd D. The organist, to open the folds, operates the swellpedal, which causes the rod D to travellou-y gitudinally, carrying with itthe rods F F and .opening the folds, as shown in Fig. 3. From this arrangement of the mechanism it will be observed thatwheu closed it will take more travel of the rod D to open the folds a given distance than when the same are nearly wide/ open, and near the position shown in dotted lines in. Fig'. 3. This is of great fpractical.

utility,l for the, c-: essfuli)parationefv a'sw'eii' 76g `depends".up'ou the ability of the organist to,

eifect'a' gradual openingof the4 swell-folds, particularly at the'be'ginning of a/crescendo, for the change from piano is most marked at the moment the folds begin to open, and less 7 and less markedas they progress .to the Wide` open position.

It has hitherto been4 difficult Ato produce a fine gradation of sound when thegfolds'are just opening or closing, because the devices heretoforet used of which I'am aware have lgiven the organist least control of the movel ment of the folds when nearly closed. My device, by requiring -nibre motion of the pedal f 8 to move the folds a' given distance when near the closing-point than when partly open, gives the organist perfect control of the swell atthe moment'when such control is most needed in order to produce the fine gradation of the crescendo.

Another feature of rny-invention's that the device, as already described, applies the force necessary to openy or close the folds in a line; substantially at right angles to them at all' points of the movement and in the direction most efficient fortheir .easy operation. g

A nother feature of myinvention is the opening of the two sets of folds iuoppos'ite directions, as show-n in- Fig. 3. Hitherto4 when double folds have been used they have been opened simultaneously, but in the samedircction, and it has been demonstrated in prac- LII vin Fig. 3, this difficulty is overcome, and the folds may be opened to their fullest extent, for they do not come into line until fully opened and at right angles to the swell-box, without any check to-the crescendo and without the outer folds obstructing or weakening the sound. This method of operating double folds secures both the subdued effect of the double folds when closed and the forte of the single folds when wide open, and admits of a greater distance between the extremes of piano and fortev than has hitherto been possible in a swell for pipe-organs.

My invention is applicableto single or double and to vertical or horizontal folds; but more satisfactory results are obtained by the use of doublefolds, as shown in the draW- ings. when applied to single folds, it should be placed outside of the same. rlhe device may be connected'to the ends of the folds, at

the top or bottom, or .at any intermediate point, as may be found most convenient in each particular ease.

il. The combination,with apipe-organ swellbox and swell-pedal, of the rod "D, lugs E E and G G, rods F F, and folds C C, substan tially as and for the purposes set forth.

2.' A pipe-organ having a swell-box provided with two sets of folds, one directly in front of the other, said folds being,r arranged substantially as described, `so as to be moved simultaneously in opposite directions by a single pedal, with which they are connected by a series o'f levers, as set forth.

ln a pipe-organ, the combination, with the swell-pedah of the folds C, lugs G and E, and rods D and F, arranged as described, so that a uniform and even motion of the pedal causes the folds to open with a conslautlyincreasing motion until wide open, and to close with a constantly-decreasing motion until en tirely closed, whereby a steady progressive crescendo and a steady retrogressive diminuendo are obtained, substantially as hereiubcfore set forth.

HERVE l). WILKINS. Vitnesscs:

JonN E. DURAND, Hommes 'linnn S'rnvnxs. 

